🗄️ SQLAlchemy 2.0 & Alembic Migrations: Let's Learn from ZERO!

Once you understand SQLAlchemy 2.0 + Alembic , you understand how a real Python backend talks to PostgreSQL, stores data, retrieves records, updates them, and safely changes database structure as the app grows . 🚀

No assumptions here. You don't need to know ORMs, sessions, migrations, or database internals. We'll use examples from an Instagram-like SocialFeed app throughout.

1. 🖼️ The Big Picture

SocialFeed stores users, posts, comments, likes, follows, notifications and sessions . All of it must live permanently in PostgreSQL . But your backend is written in Python , while PostgreSQL understands SQL .…